"This only does one thing, it allows a back door for a third-party to contact Apple and get access to that device with a bypass code."
If they can crack into your back-up account then they can crack into your main account and you are no more secure then with one account. Your email security doesn't become less simply because you have two accounts instead of one.
The idea behind this is, should you get locked out for whatever reason from that main account your device is not useless you can still access it through your secondary account. This doesn't make you any less secure than you already are. If they can get into the second they can get into the first and you aren't safe anyway.
However you are always more than welcome to join the rest of us on Android and break away from the chains and boundaries of Apple.